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EP1333976A1 - Procede de realisation de godets de trame dans une plaque d'heliogravure, et corps de base pouvant etre utilise dans ce procede - Google Patents

Procede de realisation de godets de trame dans une plaque d'heliogravure, et corps de base pouvant etre utilise dans ce procede

Info

Publication number
EP1333976A1
EP1333976A1 EP01980111A EP01980111A EP1333976A1 EP 1333976 A1 EP1333976 A1 EP 1333976A1 EP 01980111 A EP01980111 A EP 01980111A EP 01980111 A EP01980111 A EP 01980111A EP 1333976 A1 EP1333976 A1 EP 1333976A1
Authority
EP
European Patent Office
Prior art keywords
layer
support layer
copper
laser radiation
base body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01980111A
Other languages
German (de)
English (en)
Other versions
EP1333976B1 (fr
Inventor
Jakob Frauchiger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daetwyler Global Tec Holding AG
Original Assignee
MDC Max Daetwyler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MDC Max Daetwyler AG filed Critical MDC Max Daetwyler AG
Publication of EP1333976A1 publication Critical patent/EP1333976A1/fr
Application granted granted Critical
Publication of EP1333976B1 publication Critical patent/EP1333976B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41B—MACHINES OR ACCESSORIES FOR MAKING, SETTING, OR DISTRIBUTING TYPE; TYPE; PHOTOGRAPHIC OR PHOTOELECTRIC COMPOSING DEVICES
    • B41B17/00—Photographic composing machines having fixed or movable character carriers and without means for composing lines prior to photography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio printing

Definitions

  • the invention relates to a method according to the preamble of patent claim 1 and a base body of a gravure printing plate according to the preamble of patent claim 8.
  • DE-A 30 35 714 discloses a further method for producing pressure cups for an intaglio printing plate.
  • the still "raw" gravure form was coated with an etchant-resistant varnish.
  • the varnish was then removed with an electronic engraving device at the points where grid pits should later be available.
  • a stylus, a laser beam or an electron beam was used as the electronic engraving device.
  • an etching process was carried out to produce the grid cells.
  • the manufacturing process described here was complicated and time consuming. A method analogous to this is described in DE-A 2 344 233.
  • EP-B 0473 973 proposes to produce the cells no longer in copper but in zinc.
  • the method described in EP-B 0 473 973 can be used, it is disadvantageous in the case of the gravure printing forms produced thereby that the entire gravure Printing technology is now geared towards copper as the material in which the grid cells are located.
  • the object of the invention is to present a method and to create a base body in which or on the screen cup of a gravure printing form directly by means of laser radiation, preferably in copper, but also in other materials without an ejection crater rim, i.e. burr-free grid cups can be produced.
  • the object is achieved in that a, preferably only a single ablation support layer is applied to the base body over the upper layer areas provided for the information embossing, through which scanning pits with the laser radiation by material ablation (evaporation and / or ejection of molten material) into the jacket areas are introduced and then this support layer is removed, whereupon burr-free rest cases are obtained.
  • the laser radiation is radiation that is modulated in terms of its intensity over time. As a rule, pulsed radiation will be used, but this is not mandatory. Laser spikes, Q-switches, mode-locking etc. are also possible. When the support layer is removed, there is no change in the grid cells in the upper layer areas.
  • the quality of the grid cells produced in this way without burr is so good that a hard layer, in particular a chrome layer, can be applied without aftertreatment.
  • the chromium layer in gravure forms of this type is preferably applied with a layer thickness between 4 ⁇ m and 30 ⁇ m, in particular between 8 ⁇ m and 10 ⁇ m.
  • the burr-free grid cells preferably in copper, can be achieved in particular by selecting the support layer in such a way that it enables good energy coupling for the laser radiation with good initiation of material ablation (ablation) to the underlying material with minimized directed radiation backscattering.
  • Minimized radiation backscatter is important so that no radiation gets back into the laser resonator. This would be intensified there and could cause damage to the optical components.
  • a good energy coupling of the laser radiation is important, since then only a small portion of the radiation remains, which is still necessary for a back reflection could come into question. On the other hand, a good energy coupling causes a strong heating of the material of the support layer.
  • the support layer has changed to the liquid state, there is practically no longer any need to worry about radiation absorption. If one now selects this material of the support layer in such a way that the melting point of its essential material portion is low, the high radiation absorption also occurs quickly. However, the melting point should in any case be lower than that of the underlying upper layer material, in which the grid cells are then located. If the grid cells are to be in copper, the melting point should be below 1083 ° C.
  • the metals would be silver with 961 ° C, aluminum with 660 ° C, gold with 1063 ° C (which, however, immediately falls out of the cost), gallium and germanium with 937 ° C, indium with 927 ° C, lead at 327 ° C, tin at 232 ° C, zinc at 419 ° C, etc.
  • An essential material fraction of the layer material is understood to mean a percentage which causes the property mentioned above. Depending on the material, a substantial proportion of the material should be between 80% and close to 100%.
  • the material of the support layer is said to be a material removal in which the
  • the local thermal energy introduced with the laser radiation should cause the material underneath to melt as quickly as possible.
  • this reproducible melting is only possible if the layer thickness of the ablation support layer is the same everywhere. If this is the case, the well volume to be generated can be precisely specified via the radiated maximum pulse intensity and the pulse shape. The easiest way to determine the well volume is by experiment. Good results have resulted in copper as information-bearing layer and zinc as erosion support layer with the layer thickness of between 1 micron to 15 microns, preferably microns between 5 and 10 microns is less than 10 with a layer thickness tolerance of "3, preferably better than 5 ⁇ 10 of" 5 , A zinc layer with such accuracy is best applied galvanically.
  • the material of the ablation support layer should have the highest possible vapor pressure.
  • "Background material” ejected by the laser pulse from the information-carrying layer, which still falls fluidly onto the support layer, causes it to melt and evaporate and is then thrown away by the steam with a further loss of heat.
  • the vapor pressure of the "background material” should be at least five times lower than that of the material lying on it. If the example above remains, zinc has a vapor pressure that is about 100 times higher than that of copper.
  • the material of the ablation support layer should be able to be removed well, in particular chemically, without attacking the information-carrying jacket regions.
  • the wavelength of the laser radiation used is to be adapted to the absorption of the material of the ablation support layer.
  • the wavelength must also be adapted to the dimensions of the grid cells to be produced in accordance with the optical imaging laws.
  • a CO 2 laser (wavelength 10.6 ⁇ m) can be used for scanning cells with a diameter larger than 10 ⁇ m.
  • an Nd: YAG laser (1.06 ⁇ m) is preferred.
  • Pulse shaping and an optical structure for the beam guidance of the laser will preferably be carried out as described in EP 00 810 552.0. If an Nd: YAG laser is used, zinc has also proven itself in this case as the material of the ablation support layer.
  • the ablation support layer not only initiates material removal in the underlying material, it also causes a switch-on delay for the drilling process in the underlying layer.
  • the laser pulse has therefore already risen to a higher intensity value than its initial pulse value, which results in an increase in the drilling intensity. This results in a good, i.e. a hemispherical shape.
  • FIG. 1 shows a cross section through the base body according to the invention in an enlarged view with a pulsed laser beam generating a scanning cell
  • FIG. 2 shows a cross section analogous to FIG. 1, the removal support layer being removed here
  • FIG. 3 shows a cross section analogous to FIGS. 1 and 2, a hard layer being applied here.
  • Metallic rotogravure forms are usually made up of several functional elements.
  • a steel cylinder is usually used as the base body 1.
  • a copper layer 3 with a thickness of a few millimeters is applied to the steel cylinder.
  • the copper layer 3 is the information-bearing gravure form.
  • the information consists of an arrangement of a multiplicity of grid cells 5 which receive the color required for printing.
  • a chromium coating 7 with a typical thickness of approximately 10 ⁇ m is applied as the top layer.
  • the print information is now introduced directly into the copper layer 3 in its upper layer area 8 with a beam 9 of a pulsed Nd: YAG by material removal.
  • the copper surface 11 is galvanically provided with a zinc layer 13 as a removal support layer with a small thickness tolerance (less than 5 ⁇ 10 "5 ).
  • a small thickness tolerance less than 5 ⁇ 10 "5 .
  • the laser pulse 9 for generating a grid 5 each pierces the zinc layer 13 while melting.
  • Solid zinc has an absorption for the radiation 9 of the Nd: YAG laser of approximately 50%.
  • solid zinc shows almost no directional reflection. Does the zinc go due to its relatively low melting and its low thermal conductivity compared to copper into the liquid state, there is almost 100 percent radiation absorption. There is a strong local heating of the zinc, which continues to pass it on to the underlying copper in the absorbing state, whereupon this also changes into the liquid state. Copper is now of an almost 100 percent reflection for the radiation 9 of the Nd: YAG laser (although the reflection does not come into effect because the copper is still covered by zinc) in the solid state, now liquid in an approximately 100 percent absorption passed.
  • the copper material ejection or that of the zinc 15 lie on the zinc layer 13 and can be easily removed by chemically detaching it in a subsequent cleaning process.
  • the exposed engraving (small cup 5) in copper 3 is burr-free and can be chrome-plated without any problems.
  • Zinc in particular prevents the melts from sticking, reduces the initial reflection for the laser radiation 9 and therefore allows an efficient drilling process in copper 3.
  • the method just described is of course not limited to zinc 13 as a copper coating. As stated at the beginning, a number of other materials are possible.
  • the removal support layer to be applied to copper 3 does not necessarily have to be a metal layer either. Non-metals are also suitable, provided they have the required properties with regard to absorption, directed reflection and melting point.
  • the base body 1 of a gravure printing plate does not necessarily have to be cylindrical; it can also be semi-cylindrical, flat or shaped differently.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

L'invention concerne la réalisation d'une plaque d'héliogravure comportant de préférence un corps de base (1) à symétrie de révolution et comportant des godets de trame (5) en tant qu'informations d'impression, au moyen d'un rayonnement laser (9) modulé dans le temps, en particulier pulsé. Selon ledit procédé, sur les régions superficielles (8) du corps de base destinées à recevoir les informations gravées est appliquée une couche de renforcement d'érosion (13), à travers laquelle les godets de trame (5) sont produits dans lesdites régions superficielles (8) par ablation de matière au moyen du rayon laser (9). Ladite couche de renforcement d'érosion (13) est ensuite enlevée, ce qui permet d'obtenir des godets de trame (5) exempts de bavures.
EP01980111A 2000-11-15 2001-11-15 Procede de realisation de godets de trame dans une plaque d'heliogravure, et corps de base pouvant etre utilise dans ce procede Expired - Lifetime EP1333976B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH221900 2000-11-15
CH22192000 2000-11-15
PCT/CH2001/000668 WO2002040272A1 (fr) 2000-11-15 2001-11-15 Procede de realisation de godets de trame dans une plaque d'heliogravure, et corps de base pouvant etre utilise dans ce procede

Publications (2)

Publication Number Publication Date
EP1333976A1 true EP1333976A1 (fr) 2003-08-13
EP1333976B1 EP1333976B1 (fr) 2006-08-23

Family

ID=4568057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01980111A Expired - Lifetime EP1333976B1 (fr) 2000-11-15 2001-11-15 Procede de realisation de godets de trame dans une plaque d'heliogravure, et corps de base pouvant etre utilise dans ce procede

Country Status (5)

Country Link
US (1) US20040029048A1 (fr)
EP (1) EP1333976B1 (fr)
JP (1) JP2004512997A (fr)
DE (1) DE50110828D1 (fr)
WO (1) WO2002040272A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8038731B2 (en) 2006-03-24 2011-10-18 L'oreal S.A. Method of dyeing and lightening keratin materials in the presence of a reducing agent comprising a fluorescent disulphide dye

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US20060249491A1 (en) * 1999-09-01 2006-11-09 Hell Gravure Systems Gmbh Laser radiation source
DE50304555D1 (de) * 2002-10-17 2006-09-21 Hell Gravure Systems Gmbh Verfahren zur Herstellung einer Druckform für den Tiefdruck
AT504185B1 (de) * 2003-07-03 2009-06-15 Oebs Gmbh Verfahren zur herstellung einer druckplatte
EP1985459A3 (fr) * 2007-04-23 2009-07-29 Mdc Max Daetwyler AG Fabrication de formes d'impression à héliogravure
SE531975C2 (sv) * 2007-04-23 2009-09-22 Anders Bjurstedt Anordning för tryckning i djuptryck
DE102008035203B4 (de) 2008-07-28 2011-01-27 Leibniz-Institut für Oberflächenmodifizierung e.V. Verfahren zum Löschen und Neubebildern eines Druckzylinders
DE102009058845B4 (de) * 2009-12-18 2012-12-06 Christof Tielemann Verfahren zur Herstellung einer Druckwalze mit einer Laser-gravierten Oberfläche
DE102012205702B3 (de) 2012-04-05 2013-05-23 Schaeffler Technologies AG & Co. KG Verfahren zum Markieren von Bauteilen
JP6389695B2 (ja) * 2014-08-18 2018-09-12 理想科学工業株式会社 感熱製版装置

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DE728837C (de) * 1935-05-30 1942-12-04 Josef Horn Verfahren zum Herstellen von Flachdruckplatten
US2100258A (en) * 1936-02-15 1937-11-23 Reynolds Metals Co Composite body of copper and aluminum or copper and magnesium, and method of making same
US3474457A (en) * 1967-11-13 1969-10-21 Precision Instr Co Laser recording apparatus
US3539410A (en) * 1967-11-20 1970-11-10 Gen Photogrammetric Services L Relief models
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8038731B2 (en) 2006-03-24 2011-10-18 L'oreal S.A. Method of dyeing and lightening keratin materials in the presence of a reducing agent comprising a fluorescent disulphide dye

Also Published As

Publication number Publication date
US20040029048A1 (en) 2004-02-12
WO2002040272A1 (fr) 2002-05-23
DE50110828D1 (de) 2006-10-05
EP1333976B1 (fr) 2006-08-23
JP2004512997A (ja) 2004-04-30

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